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� v Air Sparging Pipe The air sparging horizontal pipe will consist of 5 foot lengths of Yz inch schedule 40, hand slotted to 0,030 to 0.040 inch connected individually to blank Y inch diameter schedule 40 pipe with treaded unions positioned in an array that will allow the slots to cover the entire bottom of the excavation, see Fisure 5. Y inch schedule 40 PVC pipe risers will connect to the horizontal pipe with 900 elbows. The Y inch risers will be brought to surface in such a position to be placed into a traffic vault, that will allow each riser to be fitted with an individual flowmeter valve and a common manifold that will feed the compressed clean air to each flowmeter valve, see Figure 4B. Vapor Extraction Pipe The vapor extraction pipe will be place at approximately the six foot depth and will consists of one run of four inch 0.030 slot schedule 40 PVC 20 feet long. This pipe will plugged with a 4 inch cap at the north end and machine threaded connected to ten feet of 4 inch schedule 40 PVC pipe that will terminate within the traffic box containing the ' inch air sparging risers. The vapor extraction pipe will then be buried with Y inch clean pea to the 5 foot depth. A layer of geofabric will be placed over the pea gravel surface and the excavation will be compacted backfilled to resurfacing ;rade with road base. EXCAVATED SOILS AND FLUIDS All excavated soils will be temporarily stored on site within a fence compound, placed on plastic liner and covered for later disposal at a Forward Landfill, 9999 South Austin Road, Manteca, California 95336. Forward requires a four point composite sample analyzed for TPHg, BTEX and total lead. All fluids generated during the excavating will be placed into "Baker " tanks, situated on site within the fence compound. The fluids in the tank will be sampled and analyzed prior to determining the proper disposition. Once the "Baker" tank has been emptied it will be removed from the site. NOTIFICATIONS Upon approval of thi§workplan and obtaining of all necessary permits a 48-hour notice will be given to all concern parties prior to start of any site activities. LIMITATIONS The information presented in this report is based on the following: I. The observations and data collected by field personnel. 2. The result of laboratory analyzes performed by a state certified analytical laboratory. 3. Our understanding of the regulations of San Joaquin County, the City of Stockton and the State of California. 4. References reviewed for this report. Changes in groundwater conditions can occur due to variations in rainfall, temperature, local and regional water use and local construction practices. In addition, variations in the soil and groundwater conditions could exist beyond the points explored in this investigation. 3 Excavation WP I1-2000